Sash-balance.



PATENTED DEC. 19, 1905.

W. M. POTTER.

SASH BALANCE.

APPLICATION FILED 0GT,9,1902.

W WW W UNITED STATES WILLIAM M.

PATENT OFFICE.

SASH-BALANCE.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed October 9, 1902. Serial No. 126,540.

To aZZ whom, it may concern:

Be it known that LWILLIAM M. PO TER, a citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in Sash-Balances; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to the construction of a sash-balance consisting, essentially, of three cast-metal pieces, which are fitted to each other without any machine-work and connected by a single screw and nut to retain in position the spring and the supportingstrap for the sash.

The advantages of my construction are its simplicity, economy, and ease with which the parts are assembled and taken apart.

My invention is shown in the drawings herewith, in which Figure I is a side elevation with portions broken away. Fig. II is a vertical cross-section at right angles to Fig. I. Fig. III is a vertical section parallel to Fig. I and at right angles to Fig. II. Fig. IV is a side elevation of the parts detached with portions broken away. Fig. V is a plan of the barrel.

In the figures, 1 indicates the shell, having the exterior recess 2 to receive the nut, and 3 the integral shaft, slotted at 4 to receive one end of the spiral spring 5, the other end being connected to slot 6 in barrel 7, having the inner annular flange 8 and the outer flange 9 around the hole 10, fitting the shaft. On the barrel is coiled the strap 12, secured on the post 13 and connected to the sash by the fastener 14 at its outer end.

16 is the coverplate, cut away at 17 to engage with lugs 18 on the shell, more securely to maintain the arts in position, and 20 is the integral face-p ate on the cover provided with screw-holes 21 for the screws to secure the balance in position. 22 is the single screw, and 23 the nut, by which all the parts are secured together. By the slight spring or bend in the cover (b est shown in Figs. II and IV) it can be adjusted to bear on the outer flange of the drumand regulate the friction between the drum and the parts which inclose it, thus regulating the tension of the balance. As aforesaid, my balance is very simple, consisting of a small number of parts and those simply and economically made of cast metal without any machinework. There are no loose springs, and the spring and strap are retained in position by simple means.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is Y 1. In a three-part cast-metal sash-balance, the combination of a substantially semicircular main shell having an exterior centrallyarranged recess to receive the nut, an interior integral, centrally-arranged shaft in the shell slotted at one side to receive one end of the spring, a coil-spring arranged around said shaft and having its outer end secured to the barrel, the cylindrical barrel having an inner flange adapted to engage with the inner surface of the main shell, an integral outer flange surrounding an opening fitted to the shaft and downwardly extending beyond said shaft, a cast-metal face-plate having an opening for the strap, a cover integral with the face-plate, said cover being slightly crowned and slightly resilient to engage with an outer flange on the barrel and regulate the tension of the spring, and a single screw and nut to attach the cover to the main shell, retaining all the parts in position and to regulate the pressure of the cover on the flange.

2. In a three-part cast-metal sash-balance, the combination of a substantially semicircular main shell having an exterior centrallyarranged recess to receive the nut, an interior integral, centrally-arranged shaft in the shell slotted at one side to receive one end of the spring, a coil-spring arranged around said shaft and having its outer end secured to the barrel, the cylindrical barrel having an inner flange adapted to engage with the inner surface of the main shell, an integral outer flange surrounding an opening fitted to the shaft and downwardly extending beyond said shaft, a cast metal face-plate having an opening for the strap, a cover integral with the faceplate, and a single screw and nut to attach the cover to the main shell, retaining all the parts in position and to regulate the pressure of the cover on the flange.

' 3. In a three-part cast-metal sash-balance, the combination with the main shell, an integral tubular shaft, of a spring-barrel provided with an inner and outer flange adapted outer flange on the barrel and the inner flange to engage With the main shell and the cover, a spring coiled on the shaft Within the barrel and having its end connected respectively to the shaft and the barrel, a resilient cover-plate adapted to engage With said outer flange, and a bolt to secure the parts together and to regulate the pressure of the cover against the against the shell. 10

In testimony whereof I afliX my signature in presence of two Witnesses.

WILLIAM lVLPOTTER. Witnesses:

O. C. SoHoENEoK, M. B. SMITH. 

